Hydraulic casing hook



Dec. 25, 1928.

w. BRAUER HYDRAULIC CASING noon Filed May 14, 1927 2 Sheets-Sheet 2Sheets-Sheet 2 W. BRAUER Likilifiw HYDRAULIC CASING HO K Filed May 14.1927 Dec. 25, 1928.

Patented Dec. 25, 1928.

UNITED STATES WALTER BRAUER, OF SEMINOLE, OKLAHOMA.

HYDRAULIC CASING HOOK.

Application filed. May 14,

This invention relates to casing hooks for use with well fishingapparatus and more particularly for use with an overshot for guiding thecasing thereinto.

An important object of the invention is to produce a casing hook, whichmay be employed for grasping casing, which is tilted to one side withinan enlargement of the hole, so that it is not accessible to the usualwall or casing hook.

A further and more specific object of the invention is to provide meansfor connecting the hook with an overshot, such that the hook may beangularly positioned with relation thereto and extend beyond the limitsdefined by the diameter of the casing through which the hook may bepassed.

A further object of the invention is to provide means whereby the hookmay be positively moved to its angular position when it has been loweredto the proper level.

These and other objects I attain by the construction shown in theaccompanying drawings, wherein for the purpose of illustration is showna preferred embodiment of my invention and wherein:

Figure 1 is a vertical sectional view through an overshot and guidetherefor constructed in accordance with my invention, the casing hookbeing shown in the casing engaging position;

Figure 2 is a similar view showing the easing after it has entered thelower end of the guide;

Figure 3 is a section on the line 33 of Figure 2;

Figure 4 is a section on the line 44 of Figure 2;

Figure 5 is a side elevation of the casing hook removed;

Figure 6 is a section Figure 1.

Referring now more particularly to the drawings, the numeral 10generally designates a shell adapted to be connected to the lower end ofan overshot 11. This shell has slidably mounted therein a sleeve 12,downward movement of which within the shell is limited by engagement ofthe lower end of the shell and a segmental shoulder 13 produced bythickening the lower end of the shell at its interior about a portion ofits circumference. The lower end' of the sleeve has an extension 14, thelower end of which, when the sleeve is seated upon the shoulder 13,

on the line 6-6 of 1927. Serial No. 191,403.

efitrlalnds slightly below the lower end of the s e Pivotally connectedto the lower end of the shell is a wall hook 15. This hook, in thepresent illustration, is disclosed as being pro vided upon the tubularupper end 16 at diametrically opposed points with upstanding circularcars 17 engaging in sockets 18 formed in the wall of the shell. From theears 17, the upper surface of the tubular upper end 16 of the casinghook inclines downwardly, as at 19, so that this hook may partake oflimited oscillation with relation to the sleeve before the upper end ofthe tubular portion of the hook comes into engagement with the lower endof the shell.

It will be obvious that as the sleeve 12 is moved downwardly, it willcome into engagement with the hook and force the same to oscillate, sothat the hook, instead of occupying a position where it axially alignswith the shell 1.0, will occupy a position such that its axis is at anangle to the axis of the shell and the bill 20 at the lower end thereofwill be deflected considerably to one side or the other of the axis ofthe shell and accordingly to the axis of the casing through which theshell is projected.

The upper end of the sleeve 12 has socured thereto by a threaded ring 21a cup leather 22, which engages the walls of the shell and seals thesleeve thereto. Seated upon this ring is a Babbitt ring 23, which isprovided in its center with an opening 24, the purpose of which willpresently appear. This opening is preferably about one inch in diameter.

In the use of the device, the shell is connected to the lower end of theovershot and the combination, fishing tool thus produced lowered intothe well on the lower end of the usual drill pipe string (not hereindisclosed). When the lower end of the shell is slightly below the lowerend of the well casing and aligned with the cave in which the tiltedfish P which is to be removed is located, downward movement is stoppedand the pipe line connected with the rotary table and the pump (likewisenot disclosed). Pump pressure is then applied and will force the sleeve12 downwardly, causing the hook 15 to oscillate, so that the billthereof will operate upon an increased radius to engage the tilted pipe.It is here pointed out that the pumps ordinarily employed with rotarywell drilling apparatus supply a suificient volume to build up thenecessary pressure for shifting the wall hook in this manner, despitethe provision of the central opening in the Babbitt disk. This openingis necessary to prevent dislocation of the disk during downward movementof the fishing tool in event there is any fluid in the bottom of thewell. as there generally is. If desired, however, a check valve may be.employed to close the opening 24, as indicated at 25. When the pipe hasbeen engaged and is entered in the lower end of the tubular portion 16,which is preferably slightly flared, as indicated at 16 to facilitatesuch entry, the string is lowered until the overshot engages over theupper end of the fish. In this lowering operation, the Babbitt disk 23will be forced upwardly and in event it binds, will crumple, so that itdoes not interfere in any Way with the movement of the tool.

It will be obvious that a construction of this character will permit theremoval of many pipes, which would otherwise be inaccessible for removaland a pipe which is unremovable often causes the loss of a hole, thedrilling of which has proceeded for a considerable distance. It willalso be obvious that a construction of this character may be veryreadily and cheaply produced and may be cheaply operated, since the onlypart which must be replaced after an operation thereof is the Babbittring 23. While the Babbitt ring is preferred, any readily frangiblematerial may be employed in its stead.

Since the construction hereinbefore set v forth is capable of a certainrange of change and modification without materially departing from thespirit of the invention, I do not limit In self to such specificstructure except as iereinafter claimed.

I claim 1. In a guide for overshots, a shell adapted to be connected tothe lower end of an overshot and having an inwardly extending shoulderat its lower end, a casing hook having its upper end pivotally connectedto the lower end of the shell and a sleeve slidable within the shellhaving a portion engaging the upper end of said hook to oscillate thesame upon the pivot and thereby position said hook at an angle to theaxis of the sl1ell,said shell and sleeve permitting passage of a fishupwardly therethrough for engagement with an overshot from which theshell is supported.

2. In a guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end ivotallyconnected to the lower end of the s 1e11, a sleeve slidable within theshell having a portion engaging the upper end of said hook to oscillatethe same upon the pivot and thereby position said hook at an angle tothe sums of the shell, and means for positively forcing said sleevedownwardly within the shell while the shell is in position within a wellbore.

3. In a guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end pivotallyconnected to the lower end of the shell, a sleeve slidable within theshell having a portion engaging the upper end of said hook to oscillatethe same upon the pivot and thereby position said hook at any angle tothe axis of the shell and a piston seated upon the upper end of thesleeve.

4. In a guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end pivotallyconnected to the lower end of the shell, a sleeve slidable within theshell having a portion enga ing the upper end of said hook to oscillatet e same upon the pivot and thereby position said hook at an angle tothe axis of the shell and a piston seated upon the upper end of thesleeve having a small central openmg.

5. In a guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end pivotallyconnected to the lower end of the shell, a sleeve slidable within theshell having a portion engaging the upper end of said hookto oscillatethe same upon the pivot and thereby position said hook at an angle tothe axis of the shell, a piston seated upon the upper end of the sleevehaving a small central opening, and a downwardly seating check valve forclosing said opening.

6. In a guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end pivotallyconnected to the lower end of the shell, a sleeve slidable within theshell having a portion engaging the upper end of said hook to oscillatethe same upon the pivot and thereby position said hook at an angle tothe axis of the shell, means for positively forcing said sleevedownwardly within the shell while the shell is in position within a wellbore, and means engaging upon the inner face of the shell engaging saidsleeve to prevent rotation thereof and limit the sleeve in its downwardmovement.

7. In a guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end ivotallyconnected to the lower end of the s ell, a sleeve slidable within theshell having a portion engaging the upper end of said hook to oscillatethe same upon the pivot and thereby position said hook at an angle tothe axis of the shell and a piston seated ufpon the u per end of thesleeve, the interior 0 the shell aving an enlargement engaging thesleeve and said ortion to limit downward movement of the sleeve andprevent rotation thereof.

8. In a. guide for overshots, a shell adapted to be connected to thelower end of an overshot, a casing hook having its upper end pivotallyconnected to the lower end of the shell, a sleeve slidable within theshell having a portion engaging the upper end of said hook to oscillatethe same upon the pivot and thereby position said hook at an angle tothe axis of the shell and a piston seated upon the upper end of thesleeve, said piston being of readily frangible material.

9. In combination with an overshot, an open-ended shell co-axialtherewith and connected to the lower end thereof, a casing hooksupported from the lower end of the shell and movable with relationthereto from a position where it is axially aligned with the shell to aposition where it is disposed at an angle thereto, and means operablewhile the shell is disposed within a well bore and controllable from theupper end of the bore for positively moving the hook from the firstnamed to the last named position. J

In testimony whereof I hereunto aflix my signature.

WALTER BRAUER.

